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Title: | η'-nucleus optical potential and possible η' bound states |
Author: | Nagahiro, H. Hirenzaki, S. Oset Baguena, Eulogio Ramos Gómez, Àngels |
Keywords: | Física nuclear Hadrons Mesons (Física nuclear) Constitució de la matèria Nuclear physics Hadrons Mesons (Nuclear physics) Constitution of matter |
Issue Date: | 2012 |
Publisher: | Elsevier B.V. |
Abstract: | Starting from a recent model of the η′N interaction, we evaluate the η ′-nucleus optical potential, including the contribution of lowest order in density, tρ/2mη′, together with the second-order terms accounting for η′ absorption by two nucleons. We also calculate the formation cross section of the η′bound states from (π, p) reactions on nuclei. The η′-nucleus potential suffers from uncertainties tied to the poorly known η′N interaction, which can be partially constrained by the experimental modulus of the η′N scattering length and/or the recently measured transparency ratios in η′nuclear photoproduction. Assuming an attractive interaction and taking the claimed experimental value |aη′N|= 0.1 fm, we obtain an η′optical potential in nuclear matter at saturation density of Vη′=−(8.7 + 1.8i) MeV, not attractive enough to produce η′bound states in light nuclei. Larger values of the scattering length give rise to deeper optical potentials, with moderate enough imaginary parts. For a value |aη′N|= 0.3 fm, which can still be considered to lie within the uncertainties of the experimental constraints, the spectra of light and medium nuclei show clear structures associated to η′-nuclear bound states and to threshold enhancements in the unbound region. |
Note: | Versió postprint del document publicat a: http://dx.doi.org/10.1016/j.physletb.2012.01.061 |
It is part of: | Physics Letters B, 2012, vol. 709, num. 1-2, p. 87-92 |
URI: | http://hdl.handle.net/2445/44086 |
Related resource: | http://dx.doi.org/10.1016/j.physletb.2012.01.061 |
ISSN: | 0370-2693 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) Publicacions de projectes de recerca finançats per la UE |
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